Service Section Technical Training December 2005

Loop Water Controller (LWC)

Water Source Solution WSHP, WH-B/BR Series Loop Water Controller

cooling tower pumps Water source heat pumps looping water Expansion tank boiler

Loop Water Controller

LWC Control Box

Loop Water Controller LWC Wiring Diagram

1. Features 2. System Specification 3. Operation Content

1. Features - Loop Circulating Pump Control - Heat Rejection & Addition Output Stages - Sensor - Alarm / Indication - Water Flow Switch Input - High / Low Water Temp Protection - Pre-cool / Pre-heat Protection - Outdoor (OD) Air Reset - Password Protection

1. Features - Loop Circulating Pump Control > Allows 2 loop circulating pumps with manual or auto lead lag control where operation is interchangeable - Heat Rejection & Addition Output Stages > Total 12 sets of data output can be pre-set as heat addition or heat rejection stages - Sensor: (i) Outdoor (OD) Air Sensor (ii) Water Sensor > 2 types of sensors used to sense the OD air temperature and water temperature

1. Features - Alarm / Indication > Output signal if error occurs in the system > Buzzer in the LCD panel activated when error occurs - Water Flow Switch Input > To detect the availability of water supply to the system - High and Low Water Temperature Protection > Measured by water sensor > When water temperature reached too high / low temperature, send signal and shut off the system

1. Features - Pre-cool & Pre-heat Protection > To provide protection when the temperature exceeding the too high / low temperature (when system is OFF) - Outdoor (OD) Air Reset > The heat addition ON / OFF limit setting of the system is able to be increased in respond to a drop in the OD air temperature - Password Protection > Password entry needed for authority to change / check the setting and configuration of the system

2. System Specification 2.1 System On/Off 2.2 Pump Control Function Stages of Heat Rejection & Heat Addition Control 2.4 Pre-cool & Pre-heat Protection 2.5 Outdoor (OD) Air Reset 2.6 Emergency Protection 2.7 Error Description

2. System Specification 2.1 System On/Off 2 ways to turn on/off the system via remote ON/OFF switch (S1): (a) Standard Switch (b) Smart Manager If the remote ON/OFF switch (S1) is closed – System ON If the remote ON/OFF switch (S1) is opened – System OFF

2. System Specification 2.2 Pump Control Function 2 Mode Available: i) Automatic Mode ii) Manual Mode

2. System Specification 2.2 Pump Control Function 10s after System On Sound Alarm Lead Pump Off Lag Pump On Error System Off Sound Alarm Check water flow for 15s Normal Check water flow for 15s Error Normal i) Automatic Mode: i) Automatic Mode:

2. System Specification 2.2 Pump Control Function ii) Manual Mode: ii) Manual Mode: Only 1 pump is operates Either 1 pump can be set to operate as the system is on. The checking on the water flow switch is the same as the lead pump in automatic mode

2. System Specification Stages of Heat Rejection & Heat Addition Control Addition Control 12 Output contacts ( VAC) to switch ON/OFF the boiler and cooling tower. Each contact must be pre-set from the LCD keypad to select it either as a heat addition or heat rejection contact Heat rejection and heat addition temperature setting shall be distributed in sequence and continuous as pre-set from the LCD keypad

Stages of Heat Rejection & Heat Addition Control Addition Control 2. System Specification Example:

2. System Specification Stages of Heat Rejection & Heat Addition Control Addition Control Condition of the above example setting: (i) 4 heat addition output stages and 8 heat rejection output stages (ii) Temperature hysterisys of 3°C (adjustable) (iii) Heat addition stage temperature: 18°C Heat rejection stage temperature: 30°C

2. System Specification Stages of Heat Rejection & Heat Addition Control Addition Control Example 1: ON Temperature set-pointSelection OUT117°CHeat add stage 2 OUT218°CHeat add stage 1 The first boiler will cut in when the T w drops below 18°C The second boiler will cut in when the T w is further reduce to 17°C Note: T w = water temperature

2. System Specification Stages of Heat Rejection & Heat Addition Control Addition Control Example 2: ON Temperature set-pointSelection OUT330°CHeat reject stage 1 OUT431°CHeat reject stage 2 The first cooling tower will run when the T w goes higher than 30°C The second cooling tower will run when the T w is further increase to 17°C Note: T w = water temperature

2. System Specification Stages of Heat Rejection & Heat Addition Control Addition Control Example 3: ON set-pointOFF set-pointSelection OUT117°C20°CHeat add stage 2 OUT218°C21°CHeat add stage 1 OUT330°C27°CHeat reject stage 1 OUT431°C28°CHeat reject stage 2 If T w increase from 18°C to 21°C, the boiler will turn off If T w decrease from 30°C to 27°C, the cooling tower will turn off If 18°C < T w < 30°C, both cooling tower or boiler will not run Note: T w = water temperature

2. System Specification 2.4 Pre-cool & Pre-heat Protection Function when the system is OFF The function will active according to the Too High / Low temperature set Pre-cool / heat temperature hysterisys = 5°C (fixed) Open Heater 3 Open Heater 2 Open Heater 1 Close Heater 3 Close Heater 2 Close Heater 1 Pre_Tc: Pre_Cool Temperature (Pre_Tc = Too low protect temperature) Pre_Tc + 5 Pre_Tc + 3 Pre_Tc Pre_Tc -2 Open Heat- reject 1 Open Heat- reject 2 Open Heat- reject 3 Pre_Th: Pre_Heat Temperature (Pre_Th = Too high protect temperature) Pre_Th + 2 Pre_Th Pre_Th - 3 Pre_Th - 5

2. System Specification 2.4 Pre-cool & Pre-heat Protection Example: Too High Temperature: 43°C (adjustable) Too Low Temperature: 10°C (adjustable) * When the water temperature is at or below 0°C, all the heating stages will be ON, regardless the ON/OFF temperature setting

2. System Specification 2.5 Outdoor (OD) Air Reset Applicable for Heat Add set points at very low outdoor air temperature (start at 16°C) OD reset range: 1 – 5 °C (adjustable) OD Air Temperature (°C) OD Air Reset Range (°C) 0 - 5°C

2. System Specification 2.6 Emergency Protection Low / Too Low Temp Protection Low / Too Low Temp Protection System On Sound Alarm System Continue Running Yes System Off Sound Alarm T W ≤ T LW ? No T W ≤ T TLW ? Yes No Note: T W = Water Temp T LW = Low Water Temp T TLW = Too Low Water Temp

2. System Specification 2.6 Emergency Protection High / Too High Temp Protection High / Too High Temp Protection System On Sound Alarm System Continue Running Yes System Off Sound Alarm T W ≥ T HW ? No T W ≥ T THW ? Yes No Note: T W = Water Temp T HW = High Water Temp T THW = Too High Water Temp

2. System Specification 2.6 Emergency Protection Loss of Flow Loss of Flow 10s after System On Sound Alarm Lead Pump Off Lag Pump On Error System Off Sound Alarm Check water flow for 15s Normal Check water flow for 15s Error Normal

2. System Specification 2.6 Emergency Protection Sensor Error Sensor Error Either Water Sensor or OD Air Sensor fail will sound the alarm System will be shut off

2. System Specification 2.7 Error Description

3. Operation 3.1 LCD Panel Interface & Setting 3.2 Operation Limits 3.3 Default Setting Reset Switch

3. Operation 3.1 LCD Panel Interface & Setting EnterESC LEFT RIGHT DOWN UP

3. Operation 3.1 LCD Panel Interface & Setting Main Menu Main Menu By pressing the Button ESC Main Menu Error Test Status Setting

3. Operation 3.1 LCD Panel Interface & Setting Status Status ESC Status Output Stage Temp Pump Water Flow: Yes (No) Pump Run Time 1# : On (Off) 1# : Cool (Heat) On (Off) 2# : On (Off) Water Temp: xxx°C (°F) OD Temp: xxx°C (°F) On : xxx Off : xxx°C (°F) 2# : Cool (Heat) On (Off) (3-12#): Unused Pump1: xxhr Pump2: xxhr

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Password Protected During power ON, the ‘Setting’ can only be viewed. The system MUST be turned OFF in order to change the Setting parameters.

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Mode: Auto (Manual) Lead Pump: 1# (2#) Password Protected Switch Cycle: xxxhr Pump Switch Check Time: xxxs Reset Run Time Min Run TM: xxxs ESC

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Pump Mode: - Auto >The lead lag cycle operation is activated - Manual >Only the lead pump is activated Lead Pump :1# / 2# >The 1 st or 2 nd pump can be set as lead pump in the operation Switch Cycle: xxxhr >The time for a pump to switch over to another pump Pump Switch Check Time: >The time to check the water flow after pump is On Reset Run Time: >To reset the record of the total pump run time Min Run TM: xxxs >The minimum time required for a pump to operate

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Cool Stage: xx Heat Stage: xx Password Protected Interstage Time: xxs ESC

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Output Config Cool Stage: >To set the number of cool stage for the system operation Heat Stage: >To set the number of heat stage for the system operation Interstage Time: xxs >The delay time between every stages to start operation

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Water Temp Alarm Temp Hysterysis Password Protected High TMP: xxx°C (°F) Too Hi TMP: xxx°C (°F) Low TMP: xxx°C (°F) Too Low TMP: xxx°C (°F) OD reset TMP: xxx°C (°F) ESC Set Stage Temp

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Temp (a) Water Temp Alarm High TMP: xxx°C / °F >Water temperature in warning temperature (system still on) Too Hi TMP: xxx°C / °F >Maximum allowable water temperature before system shut off Low TMP: xxx°C / °F >Water temperature in warning temperature (system still on) Too Low TMP: xxx°C / °F >Minimum allowable water temperature before system shut off ODresetTMP: xxx°C / °F >The temperature range for heat addition On/Off stages that responding to the OD air temperature

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Water Temp Alarm Temp Hysterysis Password Protected Cool Stage: xxx°C (°F) Heat Stage: xxx°C (°F) ESC Set Stage Temp

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Temp (b) Temp Hysterysis Cool Stage: xxx°C / °F >The temperature difference between ON and OFF of a Cool Stage Heat Stage: xxx°C / °F >The temperature difference between ON and OFF of a Heat Stage

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Water Temp Alarm Temp Hysterysis Password Protected Heat Rej: xxx°C (°F) Heat Add: xxx°C (°F) ESC Set Stage Temp

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Temp (c) Set Stage Temp Heat Rej: xxx°C / °F >The first cool stage temperature setting Heat Add: xxx°C / °F >The first heat stage temperature setting

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ESC Setting ODA reset Enable (Disable) Temp Pump Output Config Other Password Protected

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting ODA reset Enable / Disable To enable / disable the OD Air Reset function

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Setting ODA reset Enable (Disable) Temp Pump Output Config Other New Password: xxxx Temp Unit: °C (°F) Key Back Light: Enable (Disable) LCD Back Light: Enable (Disable) Buzzer: Enable (Disable) Set Date: DD-MM-YY Set Time: hh:mm:ss Password Protected ESC

3. Operation 3.1 LCD Panel Interface & Setting Setting Setting Other New Password: xxxx >To set new password. Default password = 8888 Temp Unit: °C / °F >To set the temperature unit Key Back Light: Enable / Disable >To enable / disable the LCD panel key back light LCD Back Light: Enable / Disable >To enable / disable LCD panel screen back light Buzzer: Enable / Disable >To enable / disable the buzzer on LCD panel Set Date: DD-MM-YY >To set the date for the LWC system Set Time: hh:mm:ss >To set the time for the LWC system

3. Operation 3.1 LCD Panel Interface & Setting Test Test Test 1#Pump: On (Off) 2#Pump: On (Off) 1#Stage: On (Off) 2#Stage: On (Off) 3#Stage: On (Off) 4#Stage: On (Off) 5#Stage: On (Off) 6#Stage: On (Off) 7#Stage: On (Off) 8#Stage: On (Off) 9#Stage: On (Off) 10#Stage: On (Off) 11#Stage: On (Off) 12#Stage: On (Off) Buzzer: On (Off) Alarm Out: On (Off) Password Protected ESC

3. Operation 3.1 LCD Panel Interface & Setting Test Test Must be operated only when the system is OFF or dry run To check the function ability of the system The display returns to default menu after 3 minutes when user stop operating the system or by pressing ESC button

3. Operation 3.1 LCD Panel Interface & Setting Error Error Error HistoryDelete Password Protected ESC

3. Operation 3.1 LCD Panel Interface & Setting Error Error To store the error records of the system Maximum 10 errors can be recorded or check Error records can be deleted

3. Operation 3.2 Operation Limit

3. Operation 3.3 Default Setting Reset Switch To reset the system setting to default setting After the power supply is Off, switch the switch 1 to ON 81 SW1 ON OFF

Thank You